The minimal number of real training sessions (eight) are necessary for making it possible to observe the onset of an effect of the Neurofeedback training, based on previous studies using a TBR Neurofeedback training (e.g. Studer et al., 2014; Doppelmayr & Weber, 2011; Leins et al., 2007; Gevensleben et al., 2009). Also, a higher number of training sessions is important to ensure that a possible delayed effect of the Neurofeedback training can still be observed.